摘要
选取极灾区北川县为研究区,利用数字高程模型(DEM)提取地形因子进行地形信息的定量分析。研究结果显示:坡度40°～50°、坡度变率在18°～30°、地形起伏度为50～70m,甚至更大的地区极易发生地震灾害。
The images before and after earthquake of Beichuan County are compared, based on tectonic background of regional geology, moreover, the various terrain factors including slope, aspect, Plan of curvature, profile curvature, slope rate and so on, are extracted from Digital Elevation Model （DEM）, to quantitatively analyze the terrain information. The preliminary result indicates as follows： in Beichuan County, the slope ranges from 40° to 50°, slope change rate is between 18° and 30°, and relief amplitude ranges from 50 m to 70 m, the seismic secondary disasters, such as landslide and barrier lake triggered by landslide in some valley areas are extremely easy to occur in even wider areas.
出处
《大地测量与地球动力学》
CSCD
北大核心
2008年第6期68-72,共5页
Journal of Geodesy and Geodynamics
基金
中国地震局地震研究所所长基金(IS200761370)
关键词
数字高程模型(DEM)
地形因子
汶川地震
地质灾害
北川地区
Digital Elevation Model （DEM）
terrain factor
Wenchuan Ms8.0 earthquake
geological hazard
Beichuan area
